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Magnitude of Sum from Dot Product
$$|\vec a+\vec b|=\sqrt{|\vec a|^2+|\vec b|^2+2\vec a\cdot\vec b}$$
Usage
- Used when the dot product is known instead of the angle.
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Magnitude of Sum from Dot Product
$$|\vec a+\vec b|=\sqrt{|\vec a|^2+|\vec b|^2+2\vec a\cdot\vec b}$$
Usage
- Used when the dot product is known instead of the angle.
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